RDL
Fig.21 – Ejector functioning
6.1.8 Shutdown
Close the shut-off element in the discharge line.
If the discharge line is equipped with a non-return or check valve, the shut-off element may remain open. If shut-off is not
possible, the pump will run in reverse rotation.
This may cause damage to mechanical seals which are not bi-directional!
The reverse runaway speed must be lower than the rated speed.
Switch off the drive, making sure that the unit runs smoothly down to a standstill. Close the auxiliary lines but only turn off the
cooling liquid supply (if applicable) after the pump has cooled down. Please refer to section 6.1.2!
In the event of frost and/or prolonged shutdowns, the pump must be drained or otherwise protected against freezing.
6.2 Operating limits
The pumps/units application limits regarding pressure, temperature and speed are stated on the data sheet and must
be strictly adhered to.
If a data sheet is not available, contact KSB.
6.2.1 Temperature of the medium handled, ambient temperature, bearing temperature
Do not operate the pump at temperatures exceeding those specified on the data sheet unless the written
consent of the KSB has been obtained.
Damage resulting from disregarding this warning will not be covered by the KSB warranty. Bearing bracket temperatures as
described in section 7.2.1 must be observed.
The safety instructions set forth in section 2.9 must be complied with.
6.2.2 Switching frequency
To prevent high temperature increases in the motor and excessive loads on the pump, coupling, motor, seals and bearings, the
switching frequency should not exceed the following number of start-ups per hour (S).
Motor rating (kW) max. S (switchings/h)
Up to 12 15
Up to 100 10
More than 100 5
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